chore: update CMake dependency configurations to remove PARENT_SCOPE

- Removed PARENT_SCOPE from various dependency target definitions in CMake files (grpc.cmake, imgui.cmake, sdl2.cmake, testing.cmake, yaml.cmake).
- Ensured that all targets are set locally for better clarity and management.

Benefits:
- Simplifies the dependency management process and improves the readability of CMake configurations.

cmake/dependencies.cmake

@@ -76,4 +76,4 @@ endif()
 message(STATUS "=================================")
 
 # Export all dependency targets for use in other CMake files
-set(YAZE_ALL_DEPENDENCIES ${YAZE_ALL_DEPENDENCIES} PARENT_SCOPE)
+set(YAZE_ALL_DEPENDENCIES ${YAZE_ALL_DEPENDENCIES})